Open Source web application tester program for load testing web applications.Record ajax requests.Tested on asp.net applications, but works with jsp, php or other.Generates a C# class that you can modify, the class has functions for handling the query/po

Rico is a JavaScript library for creating rich internet applications. Version 1 is JavaScript only. Versions 2 & 3 include server-side code (asp, asp.net, and php) to make creating web apps even easier. Versions 1 & 2 are based on Prototype and include grids, calendar & tree controls, drag & drop, and cinematic effects. Version 3 goes beyond Prototype, and includes support for jQuery, MooTools, Dojo, Ext, and BBC Glow libraries. Version 3 is only available in the SVN repository. The rico3.net branch includes a .net server control.

Parikshan is an online examination management system built using ASP.NET 3.5 Microsoft Visual Studio 2008 and the DataBase is made in Microsoft SQL Server 2005, The code is written in C#. Use of AJAX is done. It can be best viewed on Internet Explorer-7,8.
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ATTENTION
Update
(31st March 2012)
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I received a lot of email requests for releasing a new version of this software. I'm excited with this huge response. I believe a new, feature rich version will be very beneficial for the Education Community.
Soon I'll start it's development from scratch but this time it'll be built in PHP, MySQL with a rich set of features and more intuitive, easy to use interface. For this I need volunteer developers and designers, who can help me in it's development. I'll create a separate Project Home Page for this project.
Interested developers and designers can contact me via email through my SF profile page.
Regards,
Neeraj Semwal
Author: Project Parikshan

An invoice web application that allows you to enter company invoices and send them to contact people. Also allows customer users to login and view their own invoice history. Gives invoice reports and notifications of late invoices.

BusyBoxDotNet is an ASP.NET library targeting UI enhancements in web applications. It provides libraries and web controls to ease otherwise time consuming tasks and provides support and seamless integration with the latest Ajax technologies.

Comic.NET is a WebComic CMS written in ASP.NET and C#. It povides a flexible solution, easy to adapt to any kind of setup. It uses Textile formatting by default for news/blog entries. The Textile formatter is available as a standalone library.

Liberum Help Desk is a web-based application for managing support requests with in a small business or organization. It is written for ASP in VBScript/HTML and runs on Windows with IIS utilizing Windows domain or database authentication.

DotNetOpenMail - an SMTP client library for .net, written in C#.
Create basic text and html emails with attachments that can be sent
via an SMTP server.
Please visit http://dotnetopenmail.sourceforge.net/ for some examples.

A fast, modern-styled, multi-user, ASPx-based XML foto album w/ automatic thumbnails creator and ZIP mass uploading capacity from the creator of PhoenixPortals.ORG :) New version makes installation only a breeze! See Screenshots & Homepage for details.

IGotMesasge is an open source web-based application that allows individuals to easily record and send video message to others. It is easy to integrate with any website. Go to http://www.igotmessage.com for more information.